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US 8,943,917 B2Granted
Manual transmission
AssigneeGM Global Technology Operations LLC
InventorsJames B. Borgerson, Scott H. Wittkopp
Life of this patent
Estimating the term…
Abstract
A manual transmission includes an input member, an output member, a transmission input shaft, a countershaft, a reverse shaft, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.
Claims15
A manual transmission comprising:
- a transmission housing;
- first, second, third, fourth, and fifth gear sets, wherein the first gear set includes a first gear in mesh with a second gear, the second gear set includes a first gear in mesh with a second gear, the third gear set includes a first gear in mesh with a second gear, the fourth gear set includes a first gear in mesh with a second gear, and the fifth gear set includes a first gear in mesh with a second gear;
- a first reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a second reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a transmission input shaft rotatably supported in the transmission housing and wherein each of the first gear of the first, second, third, fourth, fifth gear, and first reverse sets are rotatably fixed directly to the transmission input shaft;
- a countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first, second, third, fourth, fifth, and second reverse gear sets are selectively engageable with the first countershaft;
- a reverse shaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first and the first of the second reverse gear sets are rotatably fixed directly to the reverse shaft;
- and
- at least three synchronizer assemblies each for selectively coupling at least one of the gears of the first, second, third, fourth, fifth, and second reverse gear sets with the countershaft, and
- wherein the selective engagement of at least one of the three synchronizer assemblies establishes at least one of five forward speed ratios and one reverse speed ratio.
7 more elements
A manual transmission comprising:
- a transmission housing;
- first, second, third, fourth, and fifth gear sets, wherein the first gear set includes a first gear in mesh with a second gear, the second gear set includes a first gear in mesh with a second gear, the third gear set includes a first gear in mesh with a second gear, the fourth gear set includes a first gear in mesh with a second gear, and the fifth gear set includes a first gear in mesh with a second gear;
- a first reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a second reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a transmission input shaft rotatably supported in the transmission housing and wherein each of the first gear of the first, second, third, fourth, fifth gear, and first reverse sets are rotatably fixed directly to the transmission input shaft;
- a countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first, second, third, fourth, fifth, and second reverse gear sets are selectively engageable with the first countershaft;
- a reverse shaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first and the first of the second reverse gear sets are rotatably fixed directly to the reverse shaft;
- a first synchronizer assembly for selectively connecting at least one of the second gear of the third gear set and the second gear of the fourth gear set to the countershaft;
- a second synchronizer assembly for selectively connecting at least one of the second gear of the fifth gear set and the second gear of the second reverse gear set to the countershaft;
- and
- a third synchronizer assembly for selectively connecting at least one of the second gear of the first gear set and the second gear of the second gear set to the countershaft, and
- wherein the selective engagement of the first, second, and third synchronizer assemblies establishes at least one of five forward speed ratios and one reverse speed ratio.
9 more elements
A manual transmission comprising:
- a transmission housing;
- first, second, third, fourth, and fifth gear sets, wherein the first gear set includes a first gear in mesh with a second gear, the second gear set includes a first gear in mesh with a second gear, the third gear set includes a first gear in mesh with a second gear, the fourth gear set includes a first gear in mesh with a second gear, and the fifth gear set includes a first gear in mesh with a second gear;
- a first reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a second reverse gear set including a first reverse gear in mesh with a second reverse gear;
- a transmission input shaft rotatably supported in the transmission housing and wherein each of the first gear of the first, second, third, fourth, fifth gear, and first reverse sets are rotatably fixed directly to the transmission input shaft;
- a countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first, second, third, fourth, fifth, and second reverse gear sets are selectively engageable with the first countershaft;
- a reverse shaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft, wherein each of the second gear of the first and the first of the second reverse gear sets are rotatably fixed directly to the reverse shaft;
- a first synchronizer assembly for selectively connecting at least one of the second gear of the third gear set and the second gear of the fourth gear set to the countershaft;
- a second synchronizer assembly for selectively connecting at least one of the second gear of the fifth gear set and the second gear of the second reverse gear set to the countershaft;
- and
- a third synchronizer assembly for selectively connecting at least one of the second gear of the first gear set and the second gear of the second gear set to the countershaft,
- wherein the first gear set is adjacent the second gear set, the second gear set is adjacent the fifth gear set, the fifth gear set is adjacent the second reverse gear set, the second reverse gear set is adjacent the third gear set, the third gear set is adjacent the fourth gear set, and the fourth gear set is adjacent the first reverse gear set, and
- wherein the selective engagement of the first, second, and third synchronizer assemblies establishes at least one of five forward speed ratios and one reverse speed ratio.
10 more elements
Dependencies are inferred from the claim text.